Fix UnicodeEncodeError

[skull-squadron]

Before

0 ~/Projects/homepage/static git:master ❯❯❯ starred --username steakknife --sort > README.md

Traceback (most recent call last):
  File "/usr/local/bin/starred", line 11, in <module>
    sys.exit(starred())
  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 716, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 696, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 889, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 534, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/starred.py", line 44, in starred
    data = '* [{}]({}) - {}'.format(*repo)
UnicodeEncodeError: 'ascii' codec can't encode character u'\xae' in position 33: ordinal not in range(128)
1 ~/Projects/homepage/static git:master ❯❯❯ 

After

0 ~/Projects/homepage/static git:master ❯❯❯ starred --username steakknife --sort > README.md

0 ~/Projects/tr/static git:master ❯❯❯ wc README.md
    1163   12119  120433 README.md
0 ~/Projects/homepage/static git:master ❯❯❯

[xiaopeng163]

There have the same problem for repo description.....

[skull-squadron]

@xiaopeng163 Sorry, I don't understand what you're trying to say.

[xiaopeng163]

sorry, my fault. I missed the commit of 570f884

[skull-squadron]

There's a new, similar bug, new PR incoming.